Tectonic-depositional environment and proto-type basins during the depositional period of Middle Ordovician Yijianfang Formation in Tarim Basin
Gao Huahua1, He Dengfa2, Tong Xiaoguang3, Wen Zhixin1, Wang Zhaoming1, He Jinyou2
1 Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083; 2 Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism of Ministry of Education,China University of Geosciences(Beijing),Beijing 100083; 3 China National Oil and Gas Exploration and Development Corporation,Beijing 100034;
Abstract：Proto-type basin analysis is of great use to uncover the tectonics-lithofacies palaeogeography and restore the basin-mountain coupling process and is of great significance for the guiding of petroleum exploration. Based on the newest data of drillings,seismic profiles and outcrops,with the analysis of sedimentary facies and the combination of basins and orogenic belts,this paper reconstructed tectonic-depositional environment during the depositional period of Middle Ordovician Yijianfang Formation in Tarim Basin and analyzed the features and properties of the basin,by employing the method of “point → line → planar”. During the depositional period of Yijianfang Formation,the Bachu-Tazhong and Tangnan intra-platform uplifts were the denuded zones;low-energy micrite facies were developed in the Shunnan-Tanggubasi-Yudong intra-platform sag;carbonate shoals facies were widely distributed in the Tabei and Gucheng platforms;deep-water nodular limestone and black shale facies were developed in the Kalpin intra-platform basin;the Tadong deep water basin transformed from black shale facies to terrigenous clastic turbidite facies and open platform facies were developed in Kuruktag-Luoxi area. The tectonic-depositional pattern of the Tarim Basin had the interim transition feature from the platform-basin pattern of the Early Ordovician to the uplift-depression pattern of the Late Ordovician,behaving as the palaeogeography differentiation of the Taxi platform and the reversal of the sedimentary properties of the Tadong deep water basin. We suggested that the Tarim Basin had a composite property of intracratonic and craton-margin depressions during the depositional period of Yijianfang Formation,yet overlapped by the foreland basin(Tangnan forbulge and Shunnan-Tanggubasi-Yudong back-bulge)at the southern part of the Taxi intracratonic depression and the extension basin(Kalpin craton-margin extension basin)at the northwestern part of the Taxi intracratonic depression. The tectonic-depositional environment and proto-type basin during the depositional period of Middle Ordovician Yijianfang Formation in Tarim Basin was a response to peripheral tectonic movements.
Gao Huahua,He Dengfa,Tong Xiaoguang et al. Tectonic-depositional environment and proto-type basins during the depositional period of Middle Ordovician Yijianfang Formation in Tarim Basin[J]. JOPC, 2016, 18(6): 986-1001.
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